There actually was some talk about calling each community "c/liffs." Likely won't stick, but, i get where you're coming from.
I think Lemmings in this context feels harmless enough, for me atleast. Anything is better at this point than referring to yourself as a "Redditor"
Perhaps this is a dark thought... but I'm wondering what the future Lemmy equivalents to "We did it Reddit!" or "Thanks for the gold kind stranger!" will be.
It seems like something cliche or corny always springs up, like it's unavoidable.